Electrodeposition of nickel

Abstract

The invention relates to aqueous solutions for bright and semi-bright nickel electroplating. The bath contains known ingredients such as nickel salts, boric acid ions together with three acetylenic compounds viz acetylenic alcohol, separated mono and/or di-alkoxylated derivative of acetylenic alcohol produced by reaction of acetylenic alcohol with ethylene oxide, propylene oxide or butylene oxide and N-di-substituted amino-propyne or its hydrochloride.

What we claim is: 
     
       1. An acidic aqueous solution for nickel electroplating comprising nickel sulphate, chloride and/or bromide, boric acid, at least 0.005 gms/liter of acetylene alcohol, at least 0.005 gms/liter of separated mono and/or di-alkoxylated derivative of an acetylenic alcohol produced by reaction of acetylenic alcohol with ethylene oxide, propylene oxide or butylene oxide, and at least 0.0005 gms/liter of N-di-substituted amino-propyne or its hydrochloride derivative, the total concentration of acetylenic materials being 0.01 to 0.5 grams per liter. 
     
     
       2. A solution as claimed in claim 1 wherein the alcohol is butyne 1:4 diol, butyne 1-3 ol, propargyl alcohol or methyl pentynol. 
     
     
       3. A solution as claimed in claim 1 in which the separated derivative is mono-or di-ethoxylated butyne diol or ethoxylated propargyl alcohol. 
     
     
       4. A solution as claimed in claim 1 which includes naphthalene tri sulphonic acid up to 5 grams/liter or saccharin 0.5 to 5.0 grams/liter, and sodium allyl sulphonate up to 4 grams/liter or sodium vinyl sulphonate up to 4 grams/liter.